Method for transmitting and receiving signal by aggregating a plurality of downlink carriers and two uplink carriers

ABSTRACT

When a terminal aggregates three downlink carriers by using the carrier aggregation (CA) of the LTE-A technology and transmits an uplink signal on two uplink carriers while aggregating two uplink carriers, a harmonic component and an intermodulation distortion (IMD) component are generated, thereby influencing a downlink band of the terminal itself Therefore, the present specification presents a scheme therefor.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. §119(e), this application claims the benefit of U.S. Provisional Patent Application Nos. 62/330,269, filed on May 2, 2016 and 62/368,191, filed on Jul. 29, 2016, the contents of which are all hereby incorporated by reference herein in their entirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to mobile communication.

Discussion of the Related Art

3^(rd) generation partnership project (3GPP) long term evolution (LTE) evolved from a universal mobile telecommunications system (UMTS) is introduced as the 3GPP release 8. The 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in a downlink, and uses single carrier-frequency division multiple access (SC-FDMA) in an uplink.

Development of 3GPP LTE-Advanced (LTE-A) which is an evolution of the 3GPP LTE has been completed in recent years. According to the LTE-A, a carrier aggregation (CA) technology is presented, which aggregates and uses multiple bands into one.

A frequency which can be used for LTE/LTE-A, that is, a carrier is defined in 3GPP by considering radio wave situations of various countries.

Meanwhile, when a terminal aggregates a plurality of downlink carriers by using the carrier aggregation (CA) of the LTE-A technology and transmits an uplink signal on two uplink carriers while aggregating two uplink carriers, a harmonic component and an intermodulation distortion (IMD) component are generated, thereby influencing a downlink band of the terminal itself.

SUMMARY OF THE INVENTION

Accordingly, a disclosure of the present specification has been made in an effort to solve the aforementioned problem.

In accordance with an embodiment of the present invention, provided is a method for transmitting/receiving a signal by a terminal configured to aggregate a plurality of downlink carriers and two uplink carriers. The method may include first determining, by the terminal, whether the uplink carriers include two operating bands of evolved universal terrestrial radio access (E-UTRA) operating bands 1, 2, 3, 5, 7, 8 and 12, and whether center frequency of a first uplink carrier among the uplink carriers is a first value. The method may include second determining, by the terminal, whether the downlink carriers include three operating bands of E-UTRA operating bands 1, 2, 3, 5, 7, 8, 12, 30 and 40 and whether center frequency of a third downlink carrier among the plurality of downlink carriers is a second value. The method may include receiving a downlink signal through the plurality of downlink carriers to which maximum sensitivity degradation (MSD) predetermined for a reference sensitivity of the plurality of downlink carriers is applied when result of the first determination is all true and result of the second determination is all true.

Herein, number of resource blocks(RBs) of the first uplink carrier and number of RBs of a second uplink carrier of the uplink carriers are 25.

when three downlink carriers are E-UTRA bands 1, 3 and 40 and two uplink carriers are E-UTRA bands 1 and 3, and when the first value is 1,968 MHz, center frequency of the second uplink carrier is 1735 MHz and the second value is 2,380 MHz, the MSD value is 0.5 dB or 1.0 dB.

when three downlink carriers are E-UTRA bands 1, 5 and 40 and two uplink carriers are E-UTRA bands 1 and 5, and when the first value is 1,977.5 MHz, center frequency of the second uplink carrier is 826.5 MHz and the second value is 2,305 MHz, the MSD value is 8.1 dB or 8.0 dB.

when three downlink carriers are E-UTRA bands 2, 12 and 30 and two uplink carriers are E-UTRA bands 2 and 12, and when the first value is 1,885 MHz, center frequency of the second uplink carrier is 708.5 MHz and the second value is 2,353 MHz, the MSD value is 10.0 dB.

when three downlink carriers are E-UTRA bands 3, 7 and 8 and two uplink carriers are E-UTRA bands 3 and 8, and when the first value is 1,735 MHz, center frequency of the second uplink carrier is 900 MHz and the second value is 2,635 MHz, the MSD value is 25.1 dB or 25.0 dB.

when three downlink carriers are E-UTRA bands 3, 7 and 8 and two uplink carriers are E-UTRA bands 3 and 8, and when the first value is 1,772.5 MHz, center frequency of the second uplink carrier is 910 MHz and the second value is 2,635 MHz, the MSD value is 12.9 dB.

when three downlink carriers are E-UTRA bands 3, 7 and 8 and two uplink carriers are E-UTRA bands 3 and 7, and when the first value is 1,735 MHz, center frequency of the second uplink carrier is 2530 MHz and the second value is 940 MHz, the MSD value is 14.1 dB or 14.0 dB. Herein, number of resource blocks(RBs) of the first uplink carrier is 25 and number of RBs of a second uplink carrier of the uplink carriers is 50.

In accordance with another embodiment of the present invention, provided is a terminal configured to aggregate a plurality of downlink carriers and two uplink carriers for transmitting/receiving a signal. The terminal may include a transmitter configured to transmit an uplink signal through the uplink carriers. The terminal may include a receiver configured to receive a downlink signal through the plurality of downlink carriers. The terminal may include a processor configured to control the transmitter and the receiver. Herein, the processor may first determine whether the uplink carriers include two operating bands of evolved universal terrestrial radio access (E-UTRA) operating bands 1, 2, 3, 5, 7, 8 and 12, and whether center frequency of a first uplink carrier among the uplink carriers is a first value, second determine whether the downlink carriers include three operating bands of E-UTRA operating bands 1, 2, 3, 5, 7, 8, 12, 30 and 40 and whether center frequency of a third downlink carrier among the plurality of downlink carriers is a second value, and receive a downlink signal through the plurality of downlink carriers to which maximum sensitivity degradation (MSD) predetermined for a reference sensitivity of the plurality of downlink carriers is applied when result of the first determination is all true and result of the second determination is all true.

According to a disclosure of the present invention, the above problme of the related art is solved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication system.

FIG. 2 illustrates the architecture of a radio frame according to frequency division duplex (FDD) of 3rd generation partnership project (3GPP) long term evolution (LTE).

FIG. 3 illustrates an example resource grid for one uplink or downlink slot in 3GPP LTE.

FIG. 4 illustrates the architecture of a downlink subframe.

FIG. 5 illustrates the architecture of an uplink subframe in 3GPP LTE.

FIGS. 6A and 6B are conceptual views illustrating intra-band carrier aggregation (CA).

FIGS. 7A and 7B are conceptual views illustrating inter-band carrier aggregation (CA).

FIG. 8 illustrates a situation where a harmonic component and intermodulation distortion (IMD) are introduced into downlink band when uplink signal is transmitted through two uplink carriers.

FIG. 9 illustrates one example of an RF architecture which can be used for aggregation of three downlink carriers and two uplink carriers.

FIG. 10 is a block diagram illustrating a wireless communication system in which a disclosure of the present specification is implemented.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, based on 3rd Generation Partnership Project (3GPP) long term evolution (LTE) or 3GPP LTE-advanced (LTE-A), the present invention will be applied. This is just an example, and the present invention may be applied to various wireless communication systems. Hereinafter, LTE includes LTE and/or LTE-A.

The technical terms used herein are used to merely describe specific embodiments and should not be construed as limiting the present invention. Further, the technical terms used herein should be, unless defined otherwise, interpreted as having meanings generally understood by those skilled in the art but not too broadly or too narrowly. Further, the technical terms used herein, which are determined not to exactly represent the spirit of the invention, should be replaced by or understood by such technical terms as being able to be exactly understood by those skilled in the art. Further, the general terms used herein should be interpreted in the context as defined in the dictionary, but not in an excessively narrowed manner.

The expression of the singular number in the specification includes the meaning of the plural number unless the meaning of the singular number is definitely different from that of the plural number in the context. In the following description, the term ‘include’ or ‘have’ may represent the existence of a feature, a number, a step, an operation, a component, a part or the combination thereof described in the specification, and may not exclude the existence or addition of another feature, another number, another step, another operation, another component, another part or the combination thereof.

The terms ‘first’ and ‘second’ are used for the purpose of explanation about various components, and the components are not limited to the terms ‘first’ and ‘second’. The terms ‘first’ and ‘second’ are only used to distinguish one component from another component. For example, a first component may be named as a second component without deviating from the scope of the present invention.

It will be understood that when an element or layer is referred to as being “connected to” or “coupled to” another element or layer, it can be directly connected or coupled to the other element or layer or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly connected to” or “directly coupled to” another element or layer, there are no intervening elements or layers present.

Hereinafter, exemplary embodiments of the present invention will be described in greater detail with reference to the accompanying drawings. In describing the present invention, for ease of understanding, the same reference numerals are used to denote the same components throughout the drawings, and repetitive description on the same components will be omitted. Detailed description on well-known arts which are determined to make the gist of the invention unclear will be omitted. The accompanying drawings are provided to merely make the spirit of the invention readily understood, but not should be intended to be limiting of the invention. It should be understood that the spirit of the invention may be expanded to its modifications, replacements or equivalents in addition to what is shown in the drawings.

As used herein, ‘base station’ generally refers to a fixed station that communicates with a wireless device and may be denoted by other terms such as eNB (evolved-NodeB), BTS (base transceiver system), or access point.

As used herein, user equipment (UE) may be stationary or mobile, and may be denoted by other terms such as device, wireless device, terminal, MS(mobile station), UT(user terminal), SS(subscriber station), MT(mobile terminal) and etc.

FIG. 1 Illustrates a Wireless Communication System.

Referring to FIG. 1, the wireless communication system includes at least one base station (BS) 20. Respective BSs 20 provide a communication service to particular geographical areas 20 a, 20 b, and 20 c (which are generally called cells).

The UE generally belongs to one cell and the cell to which the terminal belong is referred to as a serving cell. A base station that provides the communication service to the serving cell is referred to as a serving BS. Since the wireless communication system is a cellular system, another cell that neighbors to the serving cell is present. Another cell which neighbors to the serving cell is referred to a neighbor cell. A base station that provides the communication service to the neighbor cell is referred to as a neighbor BS. The serving cell and the neighbor cell are relatively decided based on the UE.

Hereinafter, a downlink means communication from the base station 20 to the terminal 10 and an uplink means communication from the terminal 10 to the base station 20. In the downlink, a transmitter may be a part of the base station 20 and a receiver may be a part of the terminal 10. In the uplink, the transmitter may be a part of the terminal 10 and the receiver may be a part of the base station 20.

Hereinafter, the LTE system will be described in detail.

FIG. 2 Shows a Downlink Radio Frame Structure According to FDD of 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE).

The radio frame of FIG. 2 may be found in the section 5 of 3GPP TS 36.211 V10.4.0 (2011-12) “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)”.

Referring to FIG. 2, the radio frame consists of 10 subframes. One subframe consists of two slots. Slots included in the radio frame are numbered with slot numbers 0 to 19. A time required to transmit one subframe is defined as a transmission time interval (TTI). The TTI may be a scheduling unit for data transmission. For example, one radio frame may have a length of 10 milliseconds (ms), one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.

The structure of the radio frame is for exemplary purposes only, and thus the number of subframes included in the radio frame or the number of slots included in the subframe may change variously.

Meanwhile, one slot may include a plurality of OFDM symbols. The number of OFDM symbols included in one slot may vary depending on a cyclic prefix (CP).

FIG. 3 Illustrates an Example Resource Grid for One Uplink or Downlink Slot in 3GPP LTE.

Referring to FIG. 3, the uplink slot includes a plurality of OFDM (orthogonal frequency division multiplexing) symbols in the time domain and NRB resource blocks (RBs) in the frequency domain. For example, in the LTE system, the number of resource blocks (RBs), i.e., NRB, may be one from 6 to 110.

Resource block (RB) is a resource allocation unit and includes a plurality of sub-carriers in one slot. For example, if one slot includes seven OFDM symbols in the time domain and the resource block includes 12 sub-carriers in the frequency domain, one resource block may include 7×12 resource elements (REs).

Meanwhile, the number of sub-carriers in one OFDM symbol may be one of 128, 256, 512, 1024, 1536, and 2048.

In 3GPP LTE, the resource grid for one uplink slot shown in FIG. 4 may also apply to the resource grid for the downlink slot.

FIG. 4 Illustrates the Architecture of a Downlink Sub-Frame.

In FIG. 4, assuming the normal CP, one slot includes seven OFDM symbols, by way of example.

The DL (downlink) sub-frame is split into a control region and a data region in the time domain. The control region includes up to first three OFDM symbols in the first slot of the sub-frame. However, the number of OFDM symbols included in the control region may be changed. A PDCCH (physical downlink control channel) and other control channels are allocated to the control region, and a PDSCH is allocated to the data region.

The physical channels in 3GPP LTE may be classified into data channels such as PDSCH (physical downlink shared channel) and PUSCH (physical uplink shared channel) and control channels such as PDCCH (physical downlink control channel), PCFICH (physical control format indicator channel), PHICH (physical hybrid-ARQ indicator channel) and PUCCH (physical uplink control channel).

The PCFICH transmitted in the first OFDM symbol of the sub-frame carries CIF (control format indicator) regarding the number (i.e., size of the control region) of OFDM symbols used for transmission of control channels in the sub-frame. The wireless device first receives the CIF on the PCFICH and then monitors the PDCCH.

Unlike the PDCCH, the PCFICH is transmitted through a fixed PCFICH resource in the sub-frame without using blind decoding. The PHICH carries an ACK (positive-acknowledgement)/NACK (negative-acknowledgement) signal for a UL HARQ (hybrid automatic repeat request). The ACK/NACK signal for UL (uplink) data on the PUSCH transmitted by the wireless device is sent on the PHICH.

The PBCH (physical broadcast channel) is transmitted in the first four OFDM symbols in the second slot of the first sub-frame of the radio frame. The PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is denoted MIB (master information block). In comparison, system information transmitted on the PDSCH indicated by the PDCCH is denoted SIB (system information block).

The PDCCH may carry activation of VoIP (voice over interne protocol) and a set of transmission power control commands for individual UEs in some UE group, resource allocation of an upper layer control message such as a random access response transmitted on the PDSCH, system information on DL-SCH, paging information on PCH, resource allocation information of UL-SCH (uplink shared channel), and resource allocation and transmission format of DL-SCH (downlink-shared channel). A plurality of PDCCHs may be sent in the control region, and the terminal may monitor the plurality of PDCCHs. The PDCCH is transmitted on one CCE (control channel element) or aggregation of some consecutive CCEs. The CCE is a logical allocation unit used for providing a coding rate per radio channel's state to the PDCCH. The CCE corresponds to a plurality of resource element groups. Depending on the relationship between the number of CCEs and coding rates provided by the CCEs, the format of the PDCCH and the possible number of PDCCHs are determined.

The control information transmitted through the PDCCH is denoted downlink control information (DCI). The DCI may include resource allocation of PDSCH (this is also referred to as DL (downlink) grant), resource allocation of PUSCH (this is also referred to as UL (uplink) grant), a set of transmission power control commands for individual UEs in some UE group, and/or activation of VoIP (Voice over Internet Protocol).

The base station determines a PDCCH format according to the DCI to be sent to the terminal and adds a CRC (cyclic redundancy check) to control information. The CRC is masked with a unique identifier (RNTI; radio network temporary identifier) depending on the owner or purpose of the PDCCH. In case the PDCCH is for a specific terminal, the terminal's unique identifier, such as C-RNTI (cell-RNTI), may be masked to the CRC. Or, if the PDCCH is for a paging message, a paging indicator, for example, P-RNTI (paging-RNTI) may be masked to the CRC. If the PDCCH is for a system information block (SIB), a system information identifier, SI-RNTI (system information-RNTI), may be masked to the CRC. In order to indicate a random access response that is a response to the terminal's transmission of a random access preamble, an RA-RNTI (random access-RNTI) may be masked to the CRC.

In 3GPP LTE, blind decoding is used for detecting a PDCCH. The blind decoding is a scheme of identifying whether a PDCCH is its own control channel by demasking a desired identifier to the CRC (cyclic redundancy check) of a received PDCCH (this is referred to as candidate PDCCH) and checking a CRC error. The base station determines a PDCCH format according to the DCI to be sent to the wireless device, then adds a CRC to the DCI, and masks a unique identifier (this is referred to as RNTI (radio network temporary identifier) to the CRC depending on the owner or purpose of the PDCCH.

The uplink channels include a PUSCH, a PUCCH, an SRS (Sounding Reference Signal), and a PRACH (physical random access channel).

FIG. 5 Illustrates the Architecture of an Uplink Sub-Frame in 3GPP LTE.

Referring to FIG. 5, the uplink sub-frame may be separated into a control region and a data region in the frequency domain. The control region is assigned a PUCCH (physical uplink control channel) for transmission of uplink control information. The data region is assigned a PUSCH (physical uplink shared channel) for transmission of data (in some cases, control information may also be transmitted).

The PUCCH for one terminal is assigned in resource block (RB) pair in the sub-frame. The resource blocks in the resource block pair take up different sub-carriers in each of the first and second slots. The frequency occupied by the resource blocks in the resource block pair assigned to the PUCCH is varied with respect to a slot boundary. This is referred to as the RB pair assigned to the PUCCH having been frequency-hopped at the slot boundary.

The terminal may obtain a frequency diversity gain by transmitting uplink control information through different sub-carriers over time. m is a location index that indicates a logical frequency domain location of a resource block pair assigned to the PUCCH in the sub-frame.

The uplink control information transmitted on the PUCCH includes an HARQ (hybrid automatic repeat request), an ACK (acknowledgement)/NACK (non-acknowledgement), a CQI (channel quality indicator) indicating a downlink channel state, and an SR (scheduling request) that is an uplink radio resource allocation request.

The PUSCH is mapped with a UL-SCH that is a transport channel. The uplink data transmitted on the PUSCH may be a transport block that is a data block for the UL-SCH transmitted for the TTI. The transport block may be user information. Or, the uplink data may be multiplexed data. The multiplexed data may be data obtained by multiplexing the transport block for the UL-SCH and control information. For example, the control information multiplexed with the data may include a CQI, a PMI (precoding matrix indicator), an HARQ, and an RI (rank indicator).Or, the uplink data may consist only of control information.

<Carrier Aggregation: CA>

Hereinafter, a carrier aggregation system will be described.

The carrier aggregation (CA) system means aggregating multiple component carriers (CCs). By the carrier aggregation, the existing meaning of the cell is changed. According to the carrier aggregation, the cell may mean a combination of a downlink component carrier and an uplink component carrier or a single downlink component carrier.

Further, in the carrier aggregation, the cell may be divided into a primary cell, secondary cell, and a serving cell. The primary cell means a cell that operates at a primary frequency and means a cell in which the UE performs an initial connection establishment procedure or a connection reestablishment procedure with the base station or a cell indicated by the primary cell during a handover procedure. The secondary cell means a cell that operates at a secondary frequency and once an RRC connection is established, the secondary cell is configured and is used to provide an additional radio resource.

The carrier aggregation system may be divided into a continuous carrier aggregation system in which aggregated carriers are contiguous and a non-contiguous carrier aggregation system in which the aggregated carriers are separated from each other. Hereinafter, when the contiguous and non-contiguous carrier systems are just called the carrier aggregation system, it should be construed that the carrier aggregation system includes both a case in which the component carriers are contiguous and a case in which the component carriers are non-contiguous. The number of component carriers aggregated between the downlink and the uplink may be differently set. A case in which the number of downlink CCs and the number of uplink CCs are the same as each other is referred to as symmetric aggregation and a case in which the number of downlink CCs and the number of uplink CCs are different from each other is referred to as asymmetric aggregation.

Meanwhile, the carrier aggregation (CA) technologies, as described above, may be generally separated into an inter-band CA technology and an intra-band CA technology. The inter-band CA is a method that aggregates and uses CCs that are present in different bands from each other, and the intra-band CA is a method that aggregates and uses CCs in the same frequency band. Further, CA technologies are more specifically split into intra-band contiguous CA, intra-band non-contiguous CA, and inter-band non-contiguous CA.

FIGS. 6A and 6B are Concept Views Illustrating Intra-Band Carrier Aggregation (CA).

FIG. 6A illustrates intra-band contiguous CA, and FIG. 6B illustrates intra-band non-contiguous CA.

LTE-advanced adds various schemes including uplink MIMO and carrier aggregation in order to realize high-speed wireless transmission. The CA that is being discussed in LTE-advanced may be split into the intra-band contiguous CA shown in FIG. 6A and the intra-band non-contiguous CA shown in FIG. 6B.

FIGS. 7A and 7B are Concept Views Illustrating Inter-Band Carrier Aggregation.

FIG. 7A illustrates a combination of a lower band and a higher band for inter-band CA, and FIG. 7B illustrates a combination of similar frequency bands for inter-band CA.

In other words, the inter-band carrier aggregation may be separated into inter-band CA between carriers of a low band and a high band having different RF characteristics of inter-band CA as shown in FIG. 7A and inter-band CA of similar frequencies that may use a common RF terminal per component carrier due to similar RF (radio frequency) characteristics as shown in FIG. 7B.

TABLE 1 Oper- Uplink (UL) operating Downlink (DL) operating ating band band Duplex Band F_(UL) _(—) _(low)-F_(UL) _(—) _(high) F_(DL) _(—) _(low)-F_(DL) _(—) _(high) Mode 1 1920 MHz-1980 MHz 2110 MHz-2170 MHz FDD 2 1850 MHz-1910 MHz 1930 MHz-1990 MHz FDD 3 1710 MHz-1785 MHz 1805 MHz-1880 MHz FDD 4 1710 MHz-1755 MHz 2110 MHz-2155 MHz FDD 5 824 MHz-849 MHz 869 MHz-894 MHz FDD 6 830 MHz-840 MHz 875 MHz-885 MHz FDD 7 2500 MHz-2570 MHz 2620 MHz-2690 MHz FDD 8 880 MHz-915 MHz 925 MHz-960 MHz FDD 9 1749.9 MHz-1784.9 MHz 1844.9 MHz-1879.9 MHz FDD 10 1710 MHz-1770 MHz 2110 MHz-2170 MHz FDD 11 1427.9 MHz-1447.9 MHz 1475.9 MHz-1495.9 MHz FDD 12 699 MHz-716 MHz 729 MHz-746 MHz FDD 13 777 MHz-787 MHz 746 MHz-756 MHz FDD 14 788 MHz-798 MHz 758 MHz-768 MHz FDD 15 Reserved Reserved FDD 16 Reserved Reserved FDD 17 704 MHz-716 MHz 734 MHz-746 MHz FDD 18 815 MHz-830 MHz 860 MHz-875 MHz FDD 19 830 MHz-845 MHz 875 MHz-890 MHz FDD 20 832 MHz-862 MHz 791 MHz-821 MHz FDD 21 1447.9 MHz-1462.9 MHz 1495.9 MHz-1510.9 MHz FDD 22 3410 MHz-3490 MHz 3510 MHz-3590 MHz FDD 23 2000 MHz-2020 MHz 2180 MHz-2200 MHz FDD 24 1626.5 MHz-1660.5 MHz 1525 MHz-1559 MHz FDD 25 1850 MHz-1915 MHz 1930 MHz-1995 MHz FDD 26 814 MHz-849 MHz 859 MHz-894 MHz FDD 27 807 MHz-824 MHz 852 MHz-869 MHz FDD 28 703 MHz-748 MHz 758 MHz-803 MHz FDD 29 N/A N/A 717 MHz-728 MHz FDD 30 2305 MHz-2315 MHz 2350 MHz-2360 MHz FDD 31 452.5 MHz-457.5 MHz 462.5 MHz-467.5 MHz FDD 32 N/A N/A 1452 MHz-1496 MHz FDD . . . 33 1900 MHz-1920 MHz 1900 MHz-1920 MHz TDD 34 2010 MHz-2025 MHz 2010 MHz-2025 MHz TDD 35 1850 MHz-1910 MHz 1850 MHz-1910 MHz TDD 36 1930 MHz-1990 MHz 1930 MHz-1990 MHz TDD 37 1910 MHz-1930 MHz 1910 MHz-1930 MHz TDD 38 2570 MHz-2620 MHz 2570 MHz-2620 MHz TDD 39 1880 MHz-1920 MHz 1880 MHz-1920 MHz TDD 40 2300 MHz-2400 MHz 2300 MHz-2400 MHz TDD 41 2496 MHz 2690 MHz 2496 MHz 2690 MHz TDD 42 3400 MHz-3600 MHz 3400 MHz-3600 MHz TDD 43 3600 MHz-3800 MHz 3600 MHz-3800 MHz TDD 44 703 MHz-803 MHz 703 MHz-803 MHz TDD

When the operating bands are defined as shown in Table 1, each nation's frequency distributing organization may assign specific frequencies to service providers in compliance with the nation's circumstances.

Meanwhile, up to now, in a situation in which a maximum of two downlink carriers are aggregated required MPR and A-MPR, and the like have been researched. However, a situation in which three of more downlink carriers and two uplink carriers are aggregated has not researched up to now. Therefore, hereinafter, the situation will be proposed.

<Aggregation of a Plurality of Downlink Carriers and Two Uplink Carriers>

Hereinafter, when the terminal transmits the uplink signal through two uplink carriers in an aggregation situation in which a plurality of downlink carriers and two uplink carriers are aggregated, it is analyzed whether interference leaks to the downlink band of the terminal and thereafter, a solution for the leakage is presented.

In more detail, as shown in FIG. 8, presented is a scheme for preventing receiving sensitivity from being decreased as the generated harmonics component and intermodulation distortion (IMD) component flow into the downlink band of the terminal when the terminal transmits the uplink signal through two uplink carriers as shown in FIG. 12. Moreover, since a receiving sensitivity level in the downlink band of the terminal may not be completely prevented from being decreased with cross isolation and coupling loss by the PCB even though the terminal appropriately solves the decrease in receiving sensitivity, a scheme for alleviating requirements which the terminal satisfies in the related art is presented.

This invention describes a case where three or four downlink carriers are connected, but the present invention is not limited thereto. That is, the number of downlink carriers that can be transmitted by the terminal may be two or more than four.

The scheme will be described below in detail.

First, a combination in which three or four downlink carriers and two uplink carriers may be aggregated is researched. The combination is shown below by a table.

TABLE 2 Combination Combination Carrier of downlink of uplink Additional ILs [dB] aggregation carrier bands carrier bands Frequency ΔT_(IB, c) ΔR_(IB, c) 2UL/3DL CA_1A-3A-7A CA_1A-3A or 2.1G + 1.8G + 2.6G B1 0.6 B1 0.0 Inter-band CA CA_1A-7A or B3 0.6 B3 0.0 CA_3A-7A B7 0.6 B7 0.0 CA_1A-3A-40A CA_1A-3A 2.1G + 1.8G + 2.3G B1 0.5 B1 0.0 B3 0.5 B3 0.0 B40 0.5 B40 0.0 CA_1A-5A-40A CA_1A-5A 2.1G + 800M + 2.3G B1 0.5 B1 0.0 B5 0.3 B5 0.0 B40 0.5 B40 0.0 CA_1A-7A-8A CA_1A-7A or 2.1G + 2.6G + 900M B1 0.5 B1 0.0 CA_1A-8A B7 0.6 B7 0.0 B8 0.6 B8 0.2 CA_1A-8A-40A CA_1A-8A 2.1G + 900M + 2.3G B1 0.5 B1 0.0 B8 0.3 B8 0.0 B40 0.5 B40 0.0 CA_1A-42C CA_1A-42A 2.1G + 3.5G B1 0.3 B1 0.0 B42 0.8 B42 0.5 CA_2A-4A-5A CA_2A-4A 1.9G + 2.1G + 800M B2 0.5 B2 0.3 B4 0.5 B4 0.3 B5 0.3 B5 0.0 CA_2A-4A-29A CA_2A-4A 1..9G + 2.1G + 700M B2 0.5 B2 0.4 B4 0.5 B4 0.4 B29 N/A B29 0.0 CA_2A-12A-30A CA_2A-12A 1.9G + 700M + 2.3G B2 0.5 B2 0.4 B12 0.3 B12 0.0 B30 0.3 B30 0.5 CA_2A-12B CA_2A-12A 1.9G + 700M B2 0.3 B2 0.0 B12 0.3 B12 0.0 CA_3A-3A-8A CA_3A-8A 1.8G + 900M B3 TBD B3 TBD B8 TBD B8 TBD CA_3A-5A-40A CA_3A-5A 1.8G + 2.6G + 700M B3 0.5 B3 0.0 B5 0.3 B5 0.0 B40 0.5 B40 0.0 CA_3A-7A-8A CA_3A-7A or 1.8G + 2.6G + 900M B3 0.5 B3 0.0 CA_3A-8A B7 0.5 B7 0.0 B8 0.6 B8 0.2 CA_3A-8A-40A CA_3A-8A 1.8G + 900M + 2.3G B3 0.5 B3 0.0 B8 0.3 B8 0.0 B40 0.5 B40 0.0 CA_3A-42C CA_3A-42A 1.8G + 3.5G B3 0.6 B3 0.2 B42 0.8 B42 0.5 CA_4A-12A-30A CA_4A-12A 2.1G + 700M + 2.3G B4 0.5 B4 0.4 B12 0.8 B12 0.5 B30 0.3 B30 0.5 CA_4A-12B CA_4A-12A 2.1G + 700M B4 0.3 B4 0.0 B12 0.8 B12 0.5 CA_7C-28A CA_7A-28A or 2.6G + 700M B7 0.3 B7 0.0 CA_7C B28 0.3 B28 0.0 CA_19A-42C CA_19A-42A 800M + 3.5G B19 0.3 B19 0.0 B42 0.8 B42 0.5 CA_21A-42C CA_21A-42A 1.5G + 3.5G B21 0.5 B21 0.2 B42 0.8 B42 0.5 2UL/4DL CA_1A-3A- CA_1A-3A or 2.1G + 1.8G + 800M + B1 0.5 B1 0.0 Inter-band CA 5A-40A CA_1A-5A or 2.3G B3 0.5 B3 0.0 CA_3A-5A B5 0.3 B5 0.0 B40 0.5 B40 0.0 CA_1A-3A- CA_1A-3A or 2.1G + 1.8G + 900M + B1 0.5 B1 0.0 8A-40A CA_1A-8A or 2.3G B3 0.5 B3 0.0 CA_3A-8A B8 0.3 B8 0.0 B40 0.5 B40 0.0 CA_1A-3A- CA_1A-3A or 2.1G + 1.8G + 2.6G + B1 0.6 B1 0.0 7A-8A CA_1A-7A or 900M B3 0.6 B3 0.0 CA_1A-8A or B7 0.6 B7 0.0 CA_3A-7A or B8 0.6 B8 0.2 CA_3A-8A CA_2A-4A- CA_2A-4A 1.9G + 2.1G + 800M + B2 0.5 B2 0.3 5A-29A 700M B4 0.5 B4 0.3 B5 0.5 B5 0.0 B29 N/A B29 0.0 CA_3A-7C-28A CA_3A-7A or 1.8G + 2.6G + 700M B3 0.5 B3 0.0 CA_7A-28A or B7 0.5 B7 0.0 CA_7C B28 0.3 B28 0.0

When the terminal transmits the uplink signal through two uplink carriers according to the combinations, the harmonics component and the IMD component are generated, and as a result, whether the interference is applied to the downlink band of the terminal is researched and a research result is shown in a table given below.

TABLE 3 Harmonic IMD to Component to 3^(rd) and 4^(th) Interference 3^(rd) and 4^(th) band due to small Downlink CA Uplink CA band without without frequency Configuration Configuration uplink uplink separation MSD CA_1A-3A-40A CA_1A-3A — 5th order Yes To Be Discussed(TBD) Table 7.3.1A-0bA for CA_1A-3A [TS36.101] CA_1A-5A-40A CA_1A-5A — 4th order — TBD CA_1A-3A-7A CA_1A-3A — — — Not Applicable(N/A) CA_1A-7A — — Yes Table 7.3.1A-0bA for CA_1A-3A [TS36.101] CA_3A-7A — — Table 7.3.1A-0bA for CA_1A-3A [TS36.101] CA_1A-7A-8A CA_1A-7A — 5th order — No Need The IMD5 is fairly small and the overlapped region is quite small portion CA_1A-8A B8 3rd — — Table 7.3.1A-0a for harmonic CA_1A-7A-8A [TS36.101] CA_3A-8A — — — N/A CA_1A-8A-40A CA_1A-8A — — — No impact when consider a fixed Tx-Rx separation of 190 MHz in Band 1 own Rx band. CA_1A-42C CA_1A-42A — 4th order — N/A CA_2A-4A-5A CA_2A-4A — — — N/A CA_2A-4A-29A CA_2A-4A N/A CA_2A-12B CA_2A-12A — — — TBD CA_2A-12A-30A CA_2A-12A — 4th order — N/A CA_3A-5A-40A CA_3A-5A — — — TBD CA_3A-7A-8A CA_3A-7A 3rd order — Table 7.3.1A-0a for CA_3A-7A-8A [TS36.101] TBD CA_3A-8A B8 3rd 2nd and — N/A harmonic 3rd order CA_3A-8A-40A CA_3A-8A — — — Studied in 2UL/2DL CA_in Rel-14. N/A CA_3A-42C CA_3A-42A — — — N/A CA_4A-12B CA_4A-12A — — — N/A CA_4A-12A-30A CA_4A-12A — — — N/A CA_7C-28A CA_7C — — — N/A CA_7A-28A — — — Studied in 2UL/2DL CA_in Rel-14. Consider specific spectrum of the operator N/A CA_19A-42C CA_19A-42A — 4th order — N/A CA_21A-42C CA_21A-42A — — — MSD CA_1A-3A-8A- CA_1A-3A — 5th order Yes No need (already 40A into B40 covered 3DL CA_1A- 3A-40A with 2UL CA_1A-3A) CA_1A-8A 2nd harmonic — Table 7.3.1A-0a for into B3 CA_1A-3A-8A-40A [TS36.101] Table 7.3.1A-0bA for CA_1A-3A [TS36.101] CA_3A-8A — — N/A CA_1A-3A-5A- CA_1A-3A — 5th order Yes No need (already 40A into B40 covered 3DL CA_1A- 3A-40A with 2UL CA_1A-3A) CA_1A-5A — 4th order No need (already into B40 covered 3DL CA_1A- 5A-40A with 2UL CA_1A-5A) CA_3A-5A — — Table 7.3.1A-0bA for CA_1A-3A [TS36.101] CA_1A-3A-7A- CA_1A-3A — — Yes N/A 8A CA_1A-7A — 5th order No need (already into B8 covered 3DL CA_1A- 7A-8A with 2UL CA_1A-7A) CA_1A-8A 2nd harmonic — Table 7.3.1A-0a for into B3 CA_1A-3A-7A-8A [TS36.101] Table 7.3.1A-0bA for CA_1A-3A [TS36.101] 3rd harmonic — Table 7.3.1A-0a for into B7 CA_1A-3A-7A-8A [TS36.101] CA_3A-7A 3rd order No need (already into B8 covered 3DL CA_3A- 7A-8A with 2UL CA_3A-7A) CA_3A-8A 3rd harmonic 2nd & 3rd Table 7.3.1A-0a for into B7 order into CA_1A-3A-7A-8A B7 [TS36.101] No need (already covered 3DL CA_3A- 7A-8A with 2UL CA_3A-8A) CA_2A-4A-5A- CA_2A-4A — — — N/A 29A CA_3A-7C-28A CA_3A-7A — 2nd order — No need (already into B28 covered 3DL CA_3A- 7A-28A with 2UL CA_3A-7A) CA_7A-28A — 2nd order — No need (already into B3 covered 3DL CA_3A- 7A-28A with 2UL CA_7A-28A) CA_7C — — — N/A

When the uplink signal is transmitted through two uplink carriers as shown in the table given above, it is analyzed that the IMD component is generated in a total of 6 combinations.

As a scheme for preventing the IMD component from being generated, a filter may be added so as for each transmitting end to remove the frequency at which the IMD component or the harmonics component is generated.

However, although the filter is added as described above, the size of the IMD component or the harmonics component which flows into the downlink band of the terminal itself is just slightly decreased and an actually exerted influence may not be completely removed.

Therefore, in the disclosure of the present specification, a measurement value for the IMD component generated in each non-linear element and it is analyzed whether the size of the corresponding IMD component is changed when passing through each element to research how the receiving sensitivity level in the downlink band of the terminal is decreased. In addition, presented is a scheme in which the terminal alleviates requirements which need to be satisfied with respect receiving reference sensitivity (REFSENS) in the related art through the researched decrease of the receiving sensing level.

Conditions in the receiving sensitivity level research are described below.

TABLE 4 Third downlink Uplink Number bandwidth Downlink Uplink center Uplink of center Downlink carrier carrier frequency bandwidth uplink frequency bandwidth CF aggregation aggregation IMD component F_(c) (MHz) (MHz) RBs F_(c) (MHz) (MHz) (dB) B1 + B3 + B40 B1 IMD5 3*f_(B1) − 1950 5 25 2380 5 2.7 B3 2*f_(B3) 1735 5 25 B1 + B3 + B40 B1 IMD5 3*f_(B1) − 1950 5 25 2380 10 1.2¹⁾ B3 2*f_(B3) 1735 5 25 B1 + B5 + B40 B1 IMD4 2*f_(B1) − 1977.5 5 25 2305 10 1.5 B5 2*f_(B5) 826.5 5 25 B2 + B12 + B30 B2 IMD4 2*f_(B2) − 1885 5 25 2353 5 3.1 B12 2*f_(B12) 708.5 5 25 B3 + B7 + B8 B3 IMD3 2*f_(B3) − 1735 5 25 940 5 1.2 B7 f_(B7) 2530 10 50 B3 IMD2 f_(B3) + 1735 5 25 2635 10 1.0 B8 f_(B8) 900 5 25 B3 IMD3 2*f_(B3) − 1772.5 5 25 2635 10 1.8 B8 f_(B8) 910 5 25 ¹⁾This requirement only for applicable to the fallback mode from DL CA_1A-3A-5A-40A with UL CA_1A-3A.

In the above table, the center frequency of the uplink carrier is configured so that the harmonics component and the IMD component flow into the downlink band of the terminal and even in this case, maximum sensitivity degradation (MSDO is applied to apply alleviation for the receiving sensitivity degradation.

Further, similarly even to the center frequency Fc of the downlink carrier, the center frequency Fc is determined in an area where the IMD component is generated. The correction factor (CF) as a correction component for acquiring the MSD in order to distinguish and apply a difference between total power of the IMD component and power of the IMD component which influences an actual bandwidth of a modulated signal is actually measured and used.

A reference architecture is required to measure a change in size component of a signal in input/output in each element according to MSD simulation and element characteristics depending on the IMD component and the harmonics component and the MSD value is derived by determining whether elements used according to an actual carrier aggregation combination, for example, a cascaded diplexer, a triplexer, a quadplexer, a hexaplexer, and an additional filter are used.

FIG. 9 Illustrates One Example of an RF Architecture which can be used for Aggregation of Three Downlink Carriers and Two Uplink Carriers.

The RF architecture illustrated in FIG. 9 which is a structure which may be used for aggregation of three downlink carriers and two uplink carriers may include various elements including the a diplexer, a duplexer, the quadplexer, the hexaplexer, and the like.

Data is described below, which is acquired by an output variation amount depending on an input signal of a switch and the diplexer, the diplexer, the duplexer, the quadplexer, the hexaplexer, and a low noise amplifier (LNA) used in the architecture and a variation amount of a signal strength in an input/output of a power amplifier (PA).

TABLE 5 Reference architecture Cascade diplexer architecture B1 + B5 + B40 & B1 + B5 B2 + B12 + B30 & B2 + B12 B3 + B7 + B8 & B3 + B7 Quadplexer architecture B3 + B7 + B8 & B3 + B8 B1 + B3 + B40 & B1 + B3 IP2 IP3 IP4 IP5 IP2 IP3 IP4 IP5 Component (dBm) (dBm) (dBm) (dBm) (dBm) (dBm) (dBm) (dBm) Antenna 112 68 55 55 112 68 55 55 switch Diplexer 115 87 55 55 — — — — (L + H) Diplexer 110 85 55 55 110 85 55 55 (H + H) Quadplexer — — — — 110 72 55 52 Duplexer 100 75 55 53 100 75 55 53 PA Forward 28.5 32 30 28 28.5 32 30 28 PA Reversed 40 30.5 30 30 40 30.5 30 30 LNA 10 0 0 −10 10 0 0 −10

Further, when an isolation characteristic of the corresponding RF elements is organized, the isolation characteristic has characteristics shown in a table given below.

TABLE 6 Value Isolation parameter (dB) Element Antenna to antenna 10 Main antenna to diversity antenna PA (out) to PA (in) 60 PCB isolation (PA forward mixing) Diplexer 15 High (H)/low(L) band isolation Diplexer 10 High (H)/High(H) band isolation Quadplexer 20 High (H)/High(H) band isolation PA (out) to PA (out) 60 L-H/H-L cross band (diplexer + duplexer) PA (out) to PA (out) 50 H-H cross band (diplexer + diplexer) LNA (in) to PA 60 L-H/H-L cross band (diplexer + diplexer) (out) LNA (in) to PA 50 H-H cross band (diplexer + diplexer) (out) Duplexer 50 Rejection Tx band in Rx band

In respect to an alleviation value for the receiving sensitivity level predicted according to the IMD component by using the measurement data and the isolation characteristic of the element, an output IMD value is obtained according to equations given below.

P _(IMD2) =|a|*P ₁ +|b|*P ₂ −IP2   [Equation 1]

Where, |a|+|b|=2 and P1 and P2 represent input power of each element.

P _(IMD3) =|a|*P ₁ +|b|*P ₂−2·IP3   [Equation 2]

Where, |a|+|b|=3 and P1 and P2 represent the input power of each element.

P _(IMD4) =|a|*P ₁ +|b|*P ₂−3·IP3   [Equation 3]

Where, |a|+|b|=4 and P1 and P2 represent the input power of each element.

P _(IMD5) =|a|*P ₁ +|b|*P ₂−4·IP3   [Equation 4]

Where, |a|+|b|=5 and P1 and P2 represent the input power of each element.

As a result, a predicted maximum sensitivity degradation (MDSO value is proposed as shown in a table given below.

TABLE 7 Center frequency Configuration Configuration UL Number of third of downlink of uplink center UL of downlink Downlink carrier carrier frequency bandwidth uplink carrier bandwidth CF MSD aggregation aggregation IMD Fc (MHz) (MHz) RBs Fc (MHz) (MHz) (dB) (dB) B1 + B3 + B40 B1 IMD5 3*f_(B1) − 1950 5 25 2380 5 2.7  0.5 B3 2*f_(B3) 1735 5 25 B1 + B3 + B40 B1 IMD5 3*f_(B1) − 1950 5 25 2380 10 1.2   0.2 ¹⁾ B3 2*f_(B3) 1735 5 25 B1 + B5 + B40 B1 IMD4 2*f_(B1) − 1977.5 5 25 2305 10 1.5  8.1 B5 2*f_(B5) 826.5 5 25 B2 + B12 + B30 B2 IMD4 2*f_(B2) − 1885 5 25 2353 5 3.1 10.0 B12 2*f_(B12) 708.5 5 25 B3 + B7 + B8 B3 IMD3 2*f_(B3) − 1735 5 25 940 5 1.2 14.1 B7 f_(B7) 2530 10 50 B3 IMD2 f_(B3) + 1735 5 25 2635 10 1.0 25.1 B8 f_(B8) 900 5 25 B3 IMD3 2*f_(B3) − 1772.5 5 25 2635 10 1.8 12.9 B8 f_(B8) 910 5 25 ¹⁾ This requirement only for applicable to the fallback mode from DL CA_1A-3A-5A-40A with UL CA_1A-3A.

When the MSD presented in the above table is reflected to TS36.101, a first decimal point is rounded off as proposed as below.

TABLE 8 E-UTRA band/channel bandwidth/Number of RBs (N_(RB))/duplex mode Configuration Configuration Configuration Configuration Configuration Configuration of downlink of downlink of downlink of downlink of downlink of downlink carrier carrier carrier carrier carrier carrier aggregation aggregation aggregation aggregation aggregation aggregation CA_1A-3A-40A CA_1A-3A 1 1950 5 25 3 1735 5 25 40 CA_1A-3A-40A CA_1A-3A 1 1950 5 25 3 1735 5 25 40 CA_1A-5A-40A CA_1A-5A 1 1977.5 5 25 5 826.5 5 25 40 CA_2A-12A-30A CA_2A-12A 2 1885 5 25 12 708.5 5 25 30 2308 5 25 CA_3A-7A-8A CA_3A-7A 3 1735 5 25 7 2530 10 50 8 895 5 25 CA_3A-8A 3 1735 5 25 8 900 5 25 7 2515 10 50 Configuration Configuration Configuration Configuration Configuration of downlink of downlink of downlink of downlink of downlink carrier carrier carrier carrier carrier aggregation aggregation aggregation aggregation aggregation CA_1A-3A-40A 2140 5 N/A TDD- 1830 5 FDD 2380 5  1.0 CA_1A-3A-40A 2140 5 N/A TDD- 1830 5 FDD 2380 10   0.0¹⁾ CA_1A-5A-40A 2167.5 5 N/A TDD- 871.5 5 FDD 2305 10  8.0 CA_2A-12A-30A 1965 5 N/A FDD- 738.5 5 FDD 2353 5 10.0 CA_3A-7A-8A 1830 5 N/A FDD- 2650 10 FDD 940 5 14.0 1830 5 N/A FDD- 945 5 FDD 2635 10 25.0 ¹⁾This requirement only for applicable to the fallback mode from DL CA_1A-3A-5A-40A with UL CA_1A-3A.

The embodiments of the present invention which has been described up to now may be implemented through various means. For example, the embodiments of the present invention may be implemented by hardware, firmware, software, or combinations thereof. In detail, the embodiments will be descried with reference to the drawings.

FIG. 10 is a Block Diagram Illustrating a Wireless Communication System in which a Disclosure of the Present Specification is Implemented.

The base station 200 includes a processor 210, a memory 220, and a radio frequency (RF) unit 230. The memory 220 is connected with the processor 210 to store various pieces of information for driving the processor 210. The RF unit 230 is connected with the processor 210 to transmit and/or receive a radio signal. The processor 210 implements a function, a process, and/or a method which are proposed. In the aforementioned embodiment, the operation of the base station may be implemented by the processor 210.

UE 100 includes a processor 110, a memory 120, and an RF unit 130. The memory 120 is connected with the processor 110 to store various pieces of information for driving the processor 110. The RF unit 130 is connected with the processor 110 to transmit and/or receive the radio signal. The processor 110 implements a function, a process, and/or a method which are proposed.

The processor may include an application-specific integrated circuit (ASIC), another chip set, a logic circuit and/or a data processing apparatus. The memory may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and/or other storage device. The RF unit may include a baseband circuit for processing the radio signal. When the embodiment is implemented by software, the aforementioned technique may be implemented by a module (a process, a function, and the like) that performs the aforementioned function. The module may be stored in the memory and executed by the processor. The memory may be positioned inside or outside the processor and connected with the processor by various well-known means.

In the aforementioned exemplary system, methods have been described based on flowcharts as a series of steps or blocks, but the methods are not limited to the order of the steps of the present invention and any step may occur in a step or an order different from or simultaneously as the aforementioned step or order. Further, it can be appreciated by those skilled in the art that steps shown in the flowcharts are not exclusive and other steps may be included or one or more steps do not influence the scope of the present invention and may be deleted. 

What is claimed is:
 1. A method for transmitting/receiving a signal by a terminal configured to aggregate a plurality of downlink carriers and two uplink carriers, the method comprising: first determining, by the terminal, whether the uplink carriers include two operating bands among evolved universal terrestrial radio access (E-UTRA) operating bands 1, 2, 3, 5, 7, 8 and 12, and whether center frequency of a first uplink carrier among the uplink carriers is a first value; second determining, by the terminal, whether the downlink carriers include three operating bands among E-UTRA operating bands 1, 2, 3, 5, 7, 8, 12, 30 and 40 and whether center frequency of a third downlink carrier among the plurality of downlink carriers is a second value; when result of the first determination is all true and result of the second determination is all true, receiving a downlink signal through the plurality of downlink carriers to which maximum sensitivity degradation (MSD) predetermined for a reference sensitivity of the plurality of downlink carriers is applied.
 2. The method of claim 1, wherein number of resource blocks(RBs) of the first uplink carrier and number of RBs of a second uplink carrier of the uplink carriers are
 25. 3. The method of claim 2, wherein when three downlink carriers are E-UTRA bands 1, 3 and 40 and two uplink carriers are E-UTRA bands 1 and 3, and when the first value is 1,950 MHz, center frequency of the second uplink carrier is 1735 MHz and the second value is 2,380 MHz, the MSD value is 0.5 dB or 1.0 dB.
 4. The method of claim 2, wherein when three downlink carriers are E-UTRA bands 1, 5 and 40 and two uplink carriers are E-UTRA bands 1 and 5, and when the first value is 1,977.5 MHz, center frequency of the second uplink carrier is 826.5 MHz and the second value is 2,305 MHz, the MSD value is 8.1 dB or 8.0 dB.
 5. The method of claim 2, wherein when three downlink carriers are E-UTRA bands 2, 12 and 30 and two uplink carriers are E-UTRA bands 2 and 12, and when the first value is 1,885 MHz, center frequency of the second uplink carrier is 708.5 MHz and the second value is 2,353 MHz, the MSD value is 10.0 dB.
 6. The method of claim 2, wherein when three downlink carriers are E-UTRA bands 3, 7 and 8 and two uplink carriers are E-UTRA bands 3 and 8, and when the first value is 1,735 MHz, center frequency of the second uplink carrier is 900 MHz and the second value is 2,635 MHz, the MSD value is 25.1 dB or 25.0 dB.
 7. The method of claim 2, wherein when three downlink carriers are E-UTRA bands 3, 7 and 8 and two uplink carriers are E-UTRA bands 3 and 8, and when the first value is 1,772.5 MHz, center frequency of the second uplink carrier is 910 MHz and the second value is 2,635 MHz, the MSD value is 12.9 dB.
 8. The method of claim 1, wherein when three downlink carriers are E-UTRA bands 3, 7 and 8 and two uplink carriers are E-UTRA bands 3 and 7, and when the first value is 1,735 MHz, center frequency of the second uplink carrier is 2530 MHz and the second value is 940 MHz, the MSD value is 14.1 dB or 14.0 dB, and number of resource blocks(RBs) of the first uplink carrier is 25 and number of RBs of a second uplink carrier of the uplink carriers is
 50. 9. A terminal configured to aggregate a plurality of downlink carriers and two uplink carriers for transmitting/receiving a signal, the terminal comprising: a transmitter configured to transmit an uplink signal through the uplink carriers; a receiver configured to receive a downlink signal through the plurality of downlink carriers; and a processor configured to control the transmitter and the receiver, wherein the processor, first determine whether the uplink carriers include two operating bands of evolved universal terrestrial radio access (E-UTRA) operating bands 1, 2, 3, 5, 7, 8 and 12, and whether center frequency of a first uplink carrier among the uplink carriers is a first value, second determine whether the downlink carriers include three operating bands of E-UTRA operating bands 1, 2, 3, 5, 7, 8, 12, 30 and 40 and whether center frequency of a third downlink carrier among the plurality of downlink carriers is a second value, and when result of the first determination is all true and result of the second determination is all true, receive a downlink signal through the plurality of downlink carriers to which maximum sensitivity degradation (MSD) predetermined for a reference sensitivity of the plurality of downlink carriers is applied. 